In commemoration of the one-year anniversary of the massacre at Emanuel AME Church in Charleston, South Carolina, Investigation Discovery (ID) announced today the premiere of its third installment of the hit HATE IN AMERICA franchise, Lone Wolves, which centers on this story and other acts of domestic terrorism executed by "lone wolf" perpetrators. Premiering Saturday, May 21 at 8/7c, HATE IN AMERICA: Lone Wolves follows veteran journalist Tony Harris and the Southern Poverty Law Center (SPLC) as they investigate the rise of the lone wolf, revealing startling information about the dramatic increase of this deadly threat. Over the last six years alone, there have been more than 60 incidents of domestic terrorism planned by lone wolves, averaging out to one incident every 34 days In this riveting one-hour special produced by NBC News' Peacock Productions, Harris travels the country to investigate three distinct lone wolf attacks, delving into the psychology of the twisted minds of the shooters, including an anti-Semitic attack at the U.S. Holocaust Memorial Museum in 2009, the ambush of two police officers and a bystander by anti-government extremists in Las Vegas in 2014, and the 2015 massacre of nine people during a prayer meeting in a historic black church in Charleston.

HATE IN AMERICA: Lone Wolves is the third installment in ID's hit series, HATE IN AMERICA, which showcases stories from the case files of the SPLC, an organization that has been fighting hate and bigotry through litigation and education for more than four decades. According to the SPLC's 2015 Intelligence Report released earlier this spring, the number of extremist groups operating domestically grew by 14% from 2014, and the SPLC catalogued an astounding 892 hate groups in the US, including neo-Nazis, white nationalists, black separatists, Klansmen and other groups that target the LGBTQ community. These groups, according to SPLC, seek to divide our society through bigotry and, too often, violence.

HATE IN AMERICA is produced for Investigation Discovery by NBC News' Peacock Productions with Sharon Scott as President and GM and Elizabeth Fischer and Knute Walker as Executive Producers. For Investigation Discovery, Lorna Thomas is executive producer, Sara Kozak is senior vice president of production, Kevin Bennett is general manager, and Henry Schleiff is Group President of Investigation Discovery, AMERICAN HEROES CHANNEL & Destination America.

About The Southern Poverty Law Center (SPLC) The Southern Poverty Law Center is dedicated to fighting hate and bigotry and to seeking justice for the most vulnerable members of our society. Using litigation, education, and other forms of advocacy, the SPLC works toward the day when the ideals of equal justice and equal opportunity will be a reality. Founded by civil rights lawyers Morris Dees and Joseph Levin Jr. in 1971, the SPLC is internationally known for tracking and exposing the activities of hate groups. Its innovative Teaching Tolerance program produces and distributes - free of charge - documentary films, books, lesson plans and other materials that promote tolerance and respect in our nation's schools. The SPLC is based in Montgomery, Alabama, the birthplace of the modern civil rights movement, and has offices in Atlanta, New Orleans, Miami, and Jackson, Mississippi. http://www.splcenter.org

About NBC News' Peacock Productions Peacock Productions, a division of NBC News, is a nonfiction production company that combines the editorial expertise, technical resources, and seasoned talent of NBCUniversal to create series, events, and live specials for global audiences. Peacock Productions reaches more than 300 million people worldwide every year across broadcast, cable, syndication, and emerging platforms with its award-winning specials and series. Sharon Scott is the President and General Manager. For more information, visit: http://www.peacockproductions.tv/

About Investigation Discovery Investigation Discovery (ID) is the leading mystery-and-suspense network on television. From harrowing crimes and salacious scandals to the in-depth investigations and heart-breaking mysteries that result, the "always revealing" network challenges our everyday understanding of culture, society and the human condition. One of our nation's fastest growing cable networks, ID delivers the highest-quality programming to 85 million U.S. households and is available in both high definition (HD) and standard definition (SD). For more information, please visit InvestigationDiscovery.com, facebook.com/InvestigationDiscovery, or twitter.com/DiscoveryID. Investigation Discovery is part of Discovery Communications (Nasdaq: DISCA, DISCB, DISCK), the world's #1 pay-TV programmer reaching nearly 3 billion cumulative subscribers in 220 countries and territories.